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Patented Nov. 18, 1919.

F Ali/Al u G. S. LEWIS.

ART OF MANUFACTURING FRONT FORKS FOR BICYCLES.

APPLICATION FILED MAY28.1919.

UNITED STATES PATENT OFFICE.

GEORGE S. LEWIS, OE OAK PARK, ILLINOIS, ASSIGNOR TO MEAD CYCLE COMPANY.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed May 2a, 1919. Serial No. 300,337;

To all whom it may concern:

Be it known that I, GEORGE S. LEWIS, a citizen of the United States, residingat Oak Park, in the county of Cook and 10 formed of a fork crown and a fork stem, the

crown being formed. with an upwardly ex tending lugand the stem being telescoped with this lug and rigidly secured thereto as by brazing. v

The present practice in forming structures of this character is to assemble the stem w1th the In of the crown and in order that these parts s all be held together in the proper rela- .tive positions for brazing, a pin or rlvet 1s applied to the overlapping portions of these parts, these parts being first drilled to re ceive the in or rivet, this practice being objectiona le inasmuch as it is expensive.

My object is to reduce the cost of .the

manufacture of front forks and produce a desirable structure.

Referring to the accompanying drawing,

Figure 1 is a broken perspective view of a front fork of a bicycle constructed in accordance with my invention. Fig. 2 is a similar view with the upwardly extending stem portion of .the fork removed; and Fig. 3, a view of the side elevation of the" fork of the preceding figures with a portion of the struc- -ture shown in central longitudinal section.

lug, a groove 7 preferably annular, and in the assembling of the upwardly'extending stem portion 8 of the fork, telescope the lower, end of this stem portion with thelug 4, the bottom of the stem resting upon the shoulder 6. The metal of the stem portion 8 is then, by any suitable means, de-

tate of. 5 Illinois, have invented a new and useful Imcrown, a

flected inwardly to cause it extend into the groove 7 and thus become interlocked and fork crown in the assembled condition above referred to during the operation of brazmg the stem and crown together in accordance with common practice. The metal of the stem 8 may be deflec ted nto the groove 7 as by strikin the metal inwardly at several points, as or example as representedat 9, opposite the groove 7, or if desired, and as suggestive of a variation of the construction shown, the metal of the stem 8 may be sp un into the groove 7. Tl1e' provision of the groove 7 is of advantage as it may readily be cut in the lug with the wall of this groove to hold the stem 4:, and where the metal of the stem 8 is struck at different points into the groove 7 r it permits of this operation being performed quickly as the struck-in portions 9 may be located anywhere around the circle, as dis tinguished from being required'to aline the struck-in portions with relatively small recesses in the lug of the crown.

What Iclaim as new and desire .to secure by Letters Patent is:

1. The art of manufacturing front forks for bicycles which consists in providing in the upwardly-extending lug of the forkcrown, aperipheral elongated roove, tele-' scoping wlth the lug on the for -crown the stem-forming tube of the fork, deflecting the metal of the stem into the said groove, and gllieeupon brazing the structure so assem- 2. The art of manufacturing front forks for bicycles which consists in providing-in the upwardly-extending lu of the forkeripheral annul r groove, telescoping with the lug on the fork-crown the stem-forming tube of the fork, deflecting the metal of the stem into the said groove, and thereupon brazing the structure so as- 'sembled. 

